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Characterization of immunostimulatory components of orf virus (parapoxvirus ovis)

Astrid Friebe1, Sonja Friederichs2, Kai Scholz2

  • 1Institute of Medical Immunology and Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité - Universitätsmedizin Berlin, Berlin, Germany.

The Journal of General Virology
|February 25, 2011
PubMed

Insights

Inactivated orf virus (ORFV) shows potential as an antiviral therapy by activating immune cells and inducing antiviral responses. Specific ORFV proteins were identified as key mediators of this therapeutic effect, offering new avenues for treatment.

Area of Science:

  • Virology
  • Immunology
  • Antiviral Therapy

Background:

  • Inactivated orf virus (ORFV) demonstrates antiviral activity in various models and impacts human immune cells.
  • ORFV activates antigen-presenting cells (APCs) via CD14 and Toll-like receptors, releasing IFN-γ, a key antiviral mediator.

Purpose of the Study:

  • To characterize specific ORFV proteins responsible for its therapeutic antiviral effects.
  • To understand the immunomodulatory mechanisms of ORFV proteins.

Main Methods:

  • Utilized a vaccinia virus/ORFV expression library to identify active DNA fragments.
  • Expressed and purified two specific ORFV proteins.
  • Investigated gene expression profiles using microarray analysis.

Main Results:

  • Identified several multi-gene DNA fragments with immunomodulatory activity, encoding 27 ORFs.
  • Two purified proteins exhibited immunostimulatory activity.
  • ORFV and active fragments induced similar gene expression patterns, modulating APCs towards a T-helper 1 response, with concurrent immune dampening mechanisms.

Conclusions:

  • ORFV proteins activate cellular pathways to modulate APCs, generating a potent T-helper 1 immune response.
  • ORFV-induced immune responses are balanced by regulatory mechanisms, differing from single cytokine therapies.
  • ORFV holds potential as a novel antiviral therapeutic agent.

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